Warning about bad dock_image tag name does not prevent upload.

[jennydaman]

ChRIS_store_ui/src/components/CreatePlugin/CreatePlugin.jsx

Lines 157 to 176 in eb98003

	this.handleError(
	<div>
	<p>
	Please tag your Docker image by version.
	<br />
	Example:
	</p>
	<CodeBlock>
	<CodeBlockCode>
	docker tag
	{tag}
	{tag}
	:1.0.1
	<br />
	docker push
	{tag}
	:1.0.1
	</CodeBlockCode>
	</CodeBlock>
	</div>,

A warning is shown if the user-specified value for dock_image violates best practices, however this warning does not prevent the POST request form being sent, and the warning shows up only for a brief amount of time before a successful upload sign replaces it.

Expected: warning about dock_image best practice shows up and prevents the POST request from being sent.

[thessakranendonk]

I'd like to work on this one :)